Reedy’s all-new high-capacity 2500mAh 7.4V LiPo battery lets you enjoy the LiPo advantage in your Airtronics/Sanwa M11X radio. The Reedy #637 fits neatly into the transmitter’s battery holder for simple plug-and-play installation. Because it is lighter than the standard NiMH battery, the radio is less tiresome to hold during long main events or practice sessions. Plus, less weight makes the transmitter easier and less costly to transport from race to race.